http-request-smuggler

HTTP Request Smuggler This Burp Suite extension automatically detects and exploits HTTP Request Smuggling vulnerabilities using advanced desynchronization techniques developed by PortSwigger researcher James Kettle. It supports comprehensive scanning for HTTP/1.1 and HTTP/2-downgrade desync...

CVE-2026-87045

A NULL pointer dereference exists in the Zephyr HTTP/2 server within subsys/net/lib/http/http_server_http2.c. The vulnerability occurs because handle_http_frame_header() unconditionally sets client->current_stream = NULL, but CONTINUATION frames do not re-bind the stream. This leads to a NULL ...

CVE-2026-87045 NULL pointer dereference in the Zephyr HTTP/2 server when a header block is completed by a CONTINUATION frame

The HTTP/2 server in subsys/net/lib/http/httpserverhttp2.c clears the connection's stream binding at the start of every frame. handlehttpframeheader executed client-currentstream = NULL unconditionally, but a CONTINUATION frame does not open a new stream and enterhttpframecontinuationstate never...

CVE-2026-113431

The cowlib library (from version 2.7.0 onward) contains an Allocation of Resources Without Limits or Throttling vulnerability (CWE-770) in the cow_http2_machine component. The root cause is that the headers_decode/4 function fails to bound the size of the decoded header list as required by RFC 91...

EUVD-2026-118102

Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowlib allows an unauthenticated remote peer to exhaust the memory of an HTTP/2 endpoint via HPACK-indexed header fields. cowhttp2machine:headersdecode/4 in src/cowhttp2machine.erl decodes every HEADERS block with...

CVE-2026-113431 Unbounded decoded HTTP/2 header-list size in cowlib cow_http2_machine enables HPACK amplification memory exhaustion

Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowlib allows an unauthenticated remote peer to exhaust the memory of an HTTP/2 endpoint via HPACK-indexed header fields. cowhttp2machine:headersdecode/4 in src/cowhttp2machine.erl decodes every HEADERS block with...

io.netty/netty-codec-http2: io.netty/netty-codec-http3: Netty: HTTP/2 and HTTP/3 Extended CONNECT requests are downgraded as regular CONNECT requests

A flaw was found in Netty. A remote attacker could exploit this vulnerability by sending specially crafted HTTP/2 or HTTP/3 Extended CONNECT requests. Netty's HTTP-object conversion path incorrectly processes these requests as regular HTTP/1.1 CONNECT requests, leading to a loss of critical...

io.netty/netty-codec-http2: HTTP/1 authority-form CONNECT is translated to malformed HTTP/2 CONNECT with Host-controlled :authority

A flaw was found in Netty's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leadi...

io.netty/netty-codec-http2: Netty: HTTP/2 header field values are not validated by default (CR/LF/NUL passthrough)

A flaw was found in Netty's HTTP/2 stack. This vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation. When these values cross an HTTP/2 to HTTP/1.1 translation boundary,...

io.netty/netty-codec-http2: Netty: HTTP/2 HpackEncoder DoS with large table size

A flaw was found in Netty's HTTP/2 HpackEncoder. A remote attacker can exploit this by sending HTTP/2 SETTINGS frames with a very large MAXHEADERTABLESIZE. This causes the HpackEncoder to store an excessive number of unique headers, leading to increased CPU usage and memory consumption, ultimatel...

io.netty/netty-codec-http2: HTTP/1 absolute-form Host mismatch is translated to HTTP/2 :authority, overriding the request-target authority

A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2...

io.netty/netty-codec-http2: HTTP/1 authority-form CONNECT is translated to malformed HTTP/2 CONNECT with Host-controlled :authority

A flaw was found in Netty's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leadi...

io.netty/netty-codec-http2: Netty: HTTP/2 HpackEncoder DoS with large table size

A flaw was found in Netty's HTTP/2 HpackEncoder. A remote attacker can exploit this by sending HTTP/2 SETTINGS frames with a very large MAXHEADERTABLESIZE. This causes the HpackEncoder to store an excessive number of unique headers, leading to increased CPU usage and memory consumption, ultimatel...

io.netty/netty-codec-http2: Netty: HTTP/2 header field values are not validated by default (CR/LF/NUL passthrough)

A flaw was found in Netty's HTTP/2 stack. This vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation. When these values cross an HTTP/2 to HTTP/1.1 translation boundary,...

io.netty/netty-codec-http2: io.netty/netty-codec-http3: Netty: HTTP/2 and HTTP/3 Extended CONNECT requests are downgraded as regular CONNECT requests

A flaw was found in Netty. A remote attacker could exploit this vulnerability by sending specially crafted HTTP/2 or HTTP/3 Extended CONNECT requests. Netty's HTTP-object conversion path incorrectly processes these requests as regular HTTP/1.1 CONNECT requests, leading to a loss of critical...

http2smugl

http2smugl This tool helps to detect and exploit HTTP request smuggling in cases it can be achieved via HTTP/2 - HTTP/1.1 conversion by the frontend server. The scheme is as follows: 1. An attacker sends a crafted HTTP/2 request to the target server, which we call frontend. 2. The request is...

CVE-2026-96432

A flaw was found in Qt. A malicious or compromised HTTP/2 server can trigger a Denial of Service DoS against client applications by sending specific stream frames out of sequence while withholding settings acknowledgments. This improper handling induces a null pointer dereference within the Qt...

CVE-2026-95620

A flaw was found in Qt. A use-after-free vulnerability in the HTTP/2 client implementation of the QNetworkAccessManager component allows a malicious or compromised HTTP/2 server to crash the client application. This flaw primarily results in a Denial of Service DoS...

kubesploit

Kubesploit Kubesploit is a cross-platform post-exploitation HTTP/2 Command & Control server and agent dedicated for containerized environments written in Golang and built on top of Merlin project by Russel Van Tuyl @Ne0nd0g. Our Motivation While researching Docker and Kubernetes, we noticed that...

CVE-2023-44487

CVE-2023-44487 Basic vulnerability scanning to see if web servers may be vulnerable to CVE-2023-44487 This tool checks to see if a website is vulnerable to CVE-2023-44487 completely non-invasively. 1. The tool checks if a web server accepts HTTP/2 requests without downgrading them 2. If the web...